package com.summer.filesync.network;

import com.summer.filesync.model.Message;
import com.summer.filesync.util.Logger;
import java.util.concurrent.BlockingQueue;

/** 消息处理器 处理接收到的业务消息 */
public class MessageProcessor implements Runnable {

  private static final Logger logger = Logger.getLogger(MessageProcessor.class);

  private NetworkManager networkManager;
  private BlockingQueue<Message> messageQueue;
  private boolean running = true;

  public MessageProcessor(NetworkManager networkManager) {
    this.networkManager = networkManager;
    this.messageQueue = networkManager.getIncomingMessageQueue();
  }

  @Override
  public void run() {
    logger.info("MessageProcessor started");

    while (running && networkManager.isRunning()) {
      try {
        // 从队列中取出消息
        Message message = messageQueue.take();

        if (message != null) {
          processMessage(message);
        }

      } catch (InterruptedException e) {
        logger.info("MessageProcessor interrupted");
        Thread.currentThread().interrupt();
        break;
      } catch (Exception e) {
        logger.error("Error processing message", e);
      }
    }

    logger.info("MessageProcessor stopped");
  }

  /** 处理消息 */
  private void processMessage(Message message) {
    try {
      String sourceNodeId = message.getSourceNodeId();
      Message.MessageType type = message.getType();

      logger.debug("Processing message: " + type + " from " + sourceNodeId);

      switch (type) {
        case SYNC_REQUEST:
          handleSyncRequest(message);
          break;

        case SYNC_RESPONSE:
          handleSyncResponse(message);
          break;

        case FILE_LIST_REQUEST:
          handleFileListRequest(message);
          break;

        case FILE_LIST_RESPONSE:
          handleFileListResponse(message);
          break;

        case FILE_TRANSFER_REQUEST:
          handleFileTransferRequest(message);
          break;

        case FILE_TRANSFER_RESPONSE:
          handleFileTransferResponse(message);
          break;

        case FILE_CHUNK:
          handleFileChunk(message);
          break;

        case FILE_TRANSFER_COMPLETE:
          handleFileTransferComplete(message);
          break;

        case CONFLICT_DETECTED:
          handleConflictDetected(message);
          break;

        case CONFLICT_RESOLUTION:
          handleConflictResolution(message);
          break;

        default:
          logger.warn("Unknown message type: " + type + " from " + sourceNodeId);
          break;
      }

    } catch (Exception e) {
      logger.error("Error processing message: " + message, e);
    }
  }

  /** 处理同步请求 */
  private void handleSyncRequest(Message message) {
    logger.info("Handling sync request from: " + message.getSourceNodeId());

    // TODO: 实现同步请求处理逻辑
    // 1. 解析同步请求参数
    // 2. 准备文件列表
    // 3. 发送同步响应

    // 目前先记录日志
    logger.debug("Sync request payload: " + message.getPayload());
  }

  /** 处理同步响应 */
  private void handleSyncResponse(Message message) {
    logger.info("Handling sync response from: " + message.getSourceNodeId());

    // TODO: 实现同步响应处理逻辑
    // 1. 解析同步响应数据
    // 2. 比较文件差异
    // 3. 启动文件传输

    logger.debug("Sync response payload: " + message.getPayload());
  }

  /** 处理文件列表请求 */
  private void handleFileListRequest(Message message) {
    logger.info("Handling file list request from: " + message.getSourceNodeId());

    // TODO: 实现文件列表请求处理
    // 1. 扫描本地文件
    // 2. 构建文件列表
    // 3. 发送文件列表响应

    logger.debug("File list request payload: " + message.getPayload());
  }

  /** 处理文件列表响应 */
  private void handleFileListResponse(Message message) {
    logger.info("Handling file list response from: " + message.getSourceNodeId());

    // TODO: 实现文件列表响应处理
    // 1. 解析远程文件列表
    // 2. 与本地文件比较
    // 3. 确定需要同步的文件

    logger.debug("File list response payload: " + message.getPayload());
  }

  /** 处理文件传输请求 */
  private void handleFileTransferRequest(Message message) {
    logger.info("Handling file transfer request from: " + message.getSourceNodeId());

    // TODO: 实现文件传输请求处理
    // 1. 验证文件传输权限
    // 2. 准备文件传输
    // 3. 发送文件传输响应

    logger.debug("File transfer request payload: " + message.getPayload());
  }

  /** 处理文件传输响应 */
  private void handleFileTransferResponse(Message message) {
    logger.info("Handling file transfer response from: " + message.getSourceNodeId());

    // TODO: 实现文件传输响应处理
    // 1. 检查传输是否被接受
    // 2. 开始发送文件块

    logger.debug("File transfer response payload: " + message.getPayload());
  }

  /** 处理文件块 */
  private void handleFileChunk(Message message) {
    logger.debug("Handling file chunk from: " + message.getSourceNodeId());

    // TODO: 实现文件块处理
    // 1. 接收文件块数据
    // 2. 写入临时文件
    // 3. 发送确认消息

    logger.debug("Received file chunk from: " + message.getSourceNodeId());
  }

  /** 处理文件传输完成 */
  private void handleFileTransferComplete(Message message) {
    logger.info("Handling file transfer complete from: " + message.getSourceNodeId());

    // TODO: 实现文件传输完成处理
    // 1. 验证文件完整性
    // 2. 移动临时文件到目标位置
    // 3. 更新文件元数据

    logger.debug("File transfer complete payload: " + message.getPayload());
  }

  /** 处理冲突检测 */
  private void handleConflictDetected(Message message) {
    logger.warn("Handling conflict detected from: " + message.getSourceNodeId());

    // TODO: 实现冲突检测处理
    // 1. 分析冲突类型
    // 2. 应用冲突解决策略
    // 3. 发送冲突解决消息

    logger.debug("Conflict detected payload: " + message.getPayload());
  }

  /** 处理冲突解决 */
  private void handleConflictResolution(Message message) {
    logger.info("Handling conflict resolution from: " + message.getSourceNodeId());

    // TODO: 实现冲突解决处理
    // 1. 应用冲突解决方案
    // 2. 更新本地文件
    // 3. 发送确认消息

    logger.debug("Conflict resolution payload: " + message.getPayload());
  }

  /** 停止消息处理器 */
  public void stop() {
    running = false;
    logger.info("MessageProcessor stop requested");
  }

  /** 检查是否正在运行 */
  public boolean isRunning() {
    return running;
  }

  /** 获取队列大小 */
  public int getQueueSize() {
    return messageQueue.size();
  }

  /** 获取状态信息 */
  public String getStatusInfo() {
    return "MessageProcessor{" + "running=" + running + ", queueSize=" + getQueueSize() + '}';
  }
}
